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FreeBSD-EN-20:21.ipfw                                           Errata Notice
                                                          The FreeBSD Project

Topic:          Uninitialized variable in ipfw

Category:       core
Module:         ipfw
Announced:      2020-12-01
Affects:        FreeBSD 12.2
Corrected:      2020-10-18 20:54:15 UTC (stable/12, 12.2-STABLE)
                2020-12-01 19:36:36 UTC (releng/12.2, 12.2-RELEASE-p1)

For general information regarding FreeBSD Errata Notices and Security
Advisories, including descriptions of the fields above, security
branches, and the following sections, please visit
<URL:https://security.FreeBSD.org/>.

I.   Background

ipfw(8) is the command-line utility used to configure the ipfw(4) firewall.

II.  Problem Description

A regression in FreeBSD 12.2 meant that ipfw(8) fwd commands referencing
specific port numbers may configure the firewall incorrectly.

III. Impact

Forwarding rules referencing port numbers may not work as configured.

IV.  Workaround

No workaround is available.

V.   Solution

Upgrade your system to a supported FreeBSD stable or release / security
branch (releng) dated after the correction date.

Perform one of the following:

1) To update your system via a binary patch:

Systems running a RELEASE version of FreeBSD on the i386 or amd64
platforms can be updated via the freebsd-update(8) utility:

# freebsd-update fetch
# freebsd-update install

2) To update your system via a source code patch:

The following patches have been verified to apply to the applicable
FreeBSD release branches.

a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.

# fetch https://security.FreeBSD.org/patches/EN-20:21/ipfw.patch
# fetch https://security.FreeBSD.org/patches/EN-20:21/ipfw.patch.asc
# gpg --verify ipfw.patch.asc

b) Apply the patch.  Execute the following commands as root:

# cd /usr/src
# patch < /path/to/patch

c) Recompile the operating system using buildworld and installworld as
described in <URL:https://www.FreeBSD.org/handbook/makeworld.html>.

VI.  Correction details

The following list contains the correction revision numbers for each
affected branch.

Branch/path                                                      Revision
- -------------------------------------------------------------------------
stable/12/                                                        r366816
releng/12.2/                                                      r368252
- -------------------------------------------------------------------------

To see which files were modified by a particular revision, run the
following command, replacing NNNNNN with the revision number, on a
machine with Subversion installed:

# svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base

Or visit the following URL, replacing NNNNNN with the revision number:

<URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>

VII. References

<URL:https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250434>

The latest revision of this advisory is available at
<URL:https://security.FreeBSD.org/advisories/FreeBSD-EN-20:21.ipfw.asc>
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